lixinwen edited a comment on issue #1589:
URL: https://github.com/apache/rocketmq/issues/1589#issuecomment-557467562
I still recommend that rocketmq itself avoid this problem.
In our production environment, there was an accident.
In the docker environment, two tomcat processes are started without their
knowledge.
Can be modified as follows：
ConsumerGroupInfo#updateChannel
synchronized (registerLock) {
......
ClientChannelInfo infoOld =
this.channelInfoTable.get(infoNew.getChannel());
if (null == infoOld) {
for (ClientChannelInfo channelInfo : channelInfoTable.values())
{
if (clientId.equals(channelInfo.getClientId())) {
if (channel != channelInfo.getChannel()) {
log.error("channel[{}] found duplicated
clientId[{}], exists consumer: {}", channel, clientId,
channelInfo);
// Catch the exception in
ClientManageProcessor#headBeat() and close the channel, or close it directly
here.
throw new
ClientRegisterException("Duplicated clientId " + clientId);
}
}
}
}
......
}
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